US4617781A - Polypropylene wrap end seals and process for making same - Google Patents
Polypropylene wrap end seals and process for making same Download PDFInfo
- Publication number
- US4617781A US4617781A US06/680,698 US68069884A US4617781A US 4617781 A US4617781 A US 4617781A US 68069884 A US68069884 A US 68069884A US 4617781 A US4617781 A US 4617781A
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- US
- United States
- Prior art keywords
- knurl
- wrap
- sealing
- wheel
- seal
- Prior art date
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- Expired - Lifetime
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B61/00—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages
- B65B61/04—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for severing webs, or for separating joined packages
- B65B61/06—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for severing webs, or for separating joined packages by cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
- B29C65/24—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool
- B29C65/26—Hot fluid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
- B29C65/7858—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus characterised by the feeding movement of the parts to be joined
- B29C65/7879—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus characterised by the feeding movement of the parts to be joined said parts to be joined moving in a closed path, e.g. a rectangular path
- B29C65/7882—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus characterised by the feeding movement of the parts to be joined said parts to be joined moving in a closed path, e.g. a rectangular path said parts to be joined moving in a circular path
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
- B29C66/112—Single lapped joints
- B29C66/1122—Single lap to lap joints, i.e. overlap joints
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
- B29C66/431—Joining the articles to themselves
- B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
- B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
- B29C66/4322—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms by joining a single sheet to itself
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/49—Internally supporting the, e.g. tubular, article during joining
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
- B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
- B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
- B29C66/81433—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined being toothed, i.e. comprising several teeth or pins, or being patterned
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
- B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
- B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
- B29C66/83411—Roller, cylinder or drum types
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
- B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
- B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
- B29C66/83411—Roller, cylinder or drum types
- B29C66/83413—Roller, cylinder or drum types cooperating rollers, cylinders or drums
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
- B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
- B29C66/91421—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the joining tools
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B5/00—Packaging individual articles in containers or receptacles, e.g. bags, sacks, boxes, cartons, cans, jars
- B65B5/02—Machines characterised by incorporation of means for making the containers or receptacles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
- B65B51/10—Applying or generating heat or pressure or combinations thereof
- B65B51/16—Applying or generating heat or pressure or combinations thereof by rotary members
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
- B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
- B29C66/91431—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature the temperature being kept constant over time
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
- B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
- B29C66/91641—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/10—Polymers of propylene
- B29K2023/12—PP, i.e. polypropylene
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/10—Methods of surface bonding and/or assembly therefor
- Y10T156/1002—Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina
- Y10T156/1039—Surface deformation only of sandwich or lamina [e.g., embossed panels]
Definitions
- the present invention relates to a polypropylene wrap having particular application for tampons and, more specifically, to end seals and a process for sealing the ends of a voided polypropylene film wrap.
- a tampon is enclosed in a wrap or a package prior to use to prevent the tampon from becoming soiled and also from coming into contact with moisture, either of which harmfully effects the tampon.
- the wrap and its end seals need to be strong enough so as not to tear or separate during handling, yet the end seals need to tear readily to permit a user to obtain easily the tampon from within.
- Paper has been used as a medium for a tampon wrap since it is pliable and readily permits sealing of its ends by mechanical crimping.
- a paper tampon wrap has drawbacks such as the paper can be torn relatively easily, water can easily damage the paper wrap and thus the enclosed tampon and paper does not seal out ambient moisture.
- moisture effects paper namely, moisture causes paper to seal. Therefore, a paper wrap is difficult to manufacture since the moisture in the wrap during manufacturing must be controlled or else the paper wrap may seal prematurely.
- thermoplastics have been used as the medium for a tampon wrap.
- thermoplastic materials due to their nature, heretofore, could not readily be mechanically sealed and could not provide a mechanical crimped seal with the strength provided by the present invention.
- prior art thermoplastic tampon wraps have end seals which are formed by heat and pressure.
- U.S. Pat. No. 2,200,971 to Sonneborn, et al. provides a system for making, filling, and sealing packages from a thermoplastic web material in which heat and pressure are applied to form a seal. Corrugations are formed at the seal area due to the corrugations on the faces of the sealing members. This patent also provides that the end seal has beyond it a narrow unsealed margin containing a notch to facilitate opening of the package.
- U.S. Pat. No. 2,257,823 to Stokes is directed to a web which may be made of "Pliofilm", Cellophane, paper or other sheet material coated with, impregnated with, or consisting of thermoplastic material.
- the outer seal is formed by tools under conditions of temperature, pressure, and time suitable to the thermoplastic applied to or comprised in the web to thermoplastically join marginal edges of the web.
- U.S. Pat. No. 2,430,995 to Roos provides a process for sealing thermoplastic containers in which the end seals are formed by simultaneously crimping and heat sealing.
- U.S. Pat. Nos. 4,102,111 to Nack, et al. and 4,106,262 to Aterianus are directed to wrapping machines which simultaneously crimp or pressurize and heat seal a thermoplastic tube.
- U.S. Pat. No. 4,254,601 to Prager et al. is directed to an assembly for forming a plurality of individual packages each made from polypropylene.
- the assembly includes cooperating roller members for simultaneously heat sealing, crimping, notching, and severing a tubular plastic strip which is generally polypropylene.
- This patent provides that the polypropylene is heated to a temperature sufficient to melt the polypropylene so as to form a heat seal.
- a notch S 1 is provided at each end to facilitate opening.
- FIG. 1 is an overall view of the apparatus used to form the voided polypropylene film wrap with a tampon therein of the present invention.
- FIG. 2 is a perspective view of the heater unit shown in FIG. 1.
- FIG. 3 is a sectional view taken along lines 3--3 of FIG. 2.
- FIG. 4 is a sectional view of the knurl wheel-idler wheel arrangement but without the tampon wrap therebetween taken along lines 4--4 of FIG. 1.
- FIG. 5A is a perspective view of the scissors shown in FIG. 1.
- FIG. 5B is a top view of the scissors shown in FIGS. 1 and 5A.
- a tampon wrap apparatus generally represented by reference numeral 1, includes a rotating turret or wheel 2 which turret has traverse arcuate grooves along its periphery with each groove adapted to contain therein one tampon wrap.
- a flat sheet of web or wrap material such as paper or polypropylene, is folded over a cylinder 3 having an idler wheel (not shown) thereon and forwarded by conventional means to side knurl station 6 at which the flat sheet of web material 4 is formed into a tube by the idler wheel and a knurl wheel 7 pinching together and sealing the longitudinal edges of the sheet.
- the tube of web material is then forwarded to scissors 8 at which time the tube is cut into discrete lengths to form individual tampon wraps 9.
- the lengths can vary but should be of such a length so as to contain a tampon therein as well as have sufficient length to form the end seals and notches.
- all tampons sold by International Playtex, Inc. have a tampon wrap length of approximately 61/8 inches ⁇ 1/8 of an inch so as to contain a tampon of approximately 41/2 to 5 inches.
- Each cut length or wrap is then forwarded to turret 2 which brings the wrap to first end seal knurl station 10.
- Knurl station 10 includes knurl wheel 11 and idler wheel 12 which wheels should be of the same type knurl so as to provide a good, consistent end seal on the wrap.
- knurl wheel 11 and idler wheel 12 are pressed towards each other by conventional means, such as the idler wheel is positioned on an arm (not shown) and is forcibly moved by air pressure toward the knurl wheel.
- the idler and knurl wheels pinch together the first or tampon plunger end 14 of the tampon wrap 9 to form a partial seal 15 yet leave open a portion of the end.
- a tampon 26 is then inserted into the wrap through the second or tampon barrel end 16 of the wrap and then the knurl and idler wheels close the previous open portion of first end 14.
- Turret 2 then moves one increment to second end seal knurl station 30 which includes a knurl wheel 31 and an idler wheel (not shown), both of which are analogous in size and dimension to that of the knurl and idler wheels of first end seal knurl station 10, to effect sealing of second end 16.
- the above is a known paper tampon wrap apparatus which must be modified to make the apparatus suitable as a voided polypropylene film wrap apparatus.
- heater unit 40 must be added to heat the knurl wheels 11, 31.
- the knurl wheels 11, 31 should have a particular teeth configuration, must have a particular pitch, and further, in conjunction with the respective idler wheel, must exert a certain amount of pressure on the voided polypropylene film wrap so as to form an end seal by mechanical crimping.
- a voided film polypropylene is different than pure polypropylene. Specifically, a voided polypropylene film has air bubbles within the polypropylene film itself. By creating the air bubbles, a voided polypropylene film is less dense than pure polypropylene and, moreover, the air bubbles and less density assist the creation of a seal. Such voided polypropylene film is presently being sold under the mark of Hercules® WT503 (Hercules is a registered trademark of Hercules Incorporated).
- the knurl and idler wheels preferably have a substantially horizontal configuration as shown in FIG. 4.
- This type of knurl-idler wheels configuration is simpler to machine and also does not present tolerance problems with each other as does diamond and helical shaped knurl-idler wheel arrangements.
- the pitch or number of teeth on a knurl (and idler) wheel is important since too few teeth do not provide a strong seal and too many teeth cause alignment or tolerance problems.
- the pitch should be in a range of 45 to 55 with the pitch of 50 the most preferred. It has been found that a pitch of 40 does not provide a strong enough seal and a pitch of 60 causes tolerance or alignment problems.
- each knurl wheel 11 and 31 is approximately 21/2 inches so as to accommodate conveniently the 50 teeth pitch and yet conveniently fit in the wrap apparatus 1.
- a knurl width which is the measurement along line 6--6 as shown in FIG. 2, must be of a width sufficient to effect a good seal, but should not be too great or else too much force would be needed to create the seal. Accordingly, the knurl width should, preferably, be between 0.080 inches to 0.100 inches.
- the diameter of the idler wheel should be as small as possible, however, it must be sized so as to be mechanically reliable in the confines of the overall apparatus 1. Accordingly, it has been found that the diameter of idler wheel should, preferably, be 1 inch.
- tips of the teeth of the 50 pitch horizontal configurated knurl and idler wheels should be flattened, i.e. have a flat surface 18 as shown in FIG. 3 of 0.003 to 0.005 inches.
- Such flat surface teeth provide a stronger end seal apparently due to the increased sealing surface area.
- the force applied to press the wheels in first end seal knurl station 10 and second end seal knurl station 30, respectively, can be applied from either or both wheels, but the force is, preferably, applied only from, i.e. by the movement of, the idler wheel, while the knurl wheel remains stationery.
- the following is a chart of the approximate total force/inch of knurl width supplied at each end by the knurl-idler wheels to effect each end seal.
- the apparatus to seal the end of the voided polypropylene film wrap is provided with a heater unit 40.
- the heater unit 40 is in proximity to knurl station 10 and knurl station 30 adjacent to knurl wheels 11 and 31, as shown in FIG. 1, so as to provide continuous heat to the knurl wheels 11 and 31. It has been found that the precise amount of heat increases the flexibility of the polypropylene particularly the ends thereof but the heat is such so as not to form a heat seal.
- heater unit 40 has a closed chamber 41 and an air inlet port 42 for supplying compressed air into the closed chamber, and also includes a pair of legs 44, 46 each of which has an air exhaust port 45.
- Leg 44 is positioned adjacent knurl wheel 31 while leg 46 is positioned adjacent knurl wheel 11.
- the temperature in the closed air chamber needs to be in a temperature range sufficient to heat the knurl wheels to a temperature range of 110° to 140° Fahrenheit (F.) and preferably to 125° F.
- the temperature in the closed air chamber should be in a range of from 180° F. to 300° F. To maintain the heat in the closed air chamber in that temperature range, conventional high temperature thermostat 48 and low temperature thermostat 49 may be provided.
- each blade of the scissors 8 has a row of traverse grooves 50.
- the grooves of one blade are adjacent to the ungrooved portion 52 of the other blade so that when the polypropylene tube is cut, the ends of each tubular wrap has a row of notches and peaks or an alternating row of notches which facilitate the tearing of the end seal from either end.
Abstract
Description
______________________________________ FORCE/INCH AT FORCE/INCH AT STATION 10STATION 30 ______________________________________ 800 lbs. 1350 lbs. 1600 lbs. 2700 lbs. 2400 lbs. 4050 lbs. ______________________________________ Preferably, the force per/inch of knurl width at first end knurl station 10 is between approximately 800 to 1600 lbs. and the force/inch of knurl width at secondend knurl station 30 is between approximately 1350 and 2700 lbs. The difference in the pounds of force betweenstations 10 and 30 is attributed to the fact that first end knurl station 10 seals thefirst end 14 of the wrap in two stages, namely seals part of the end 15 before insertion of the tampon and then seals the open or remaining portion after insertion, while secondend knurl station 30 seals thesecond end 16 in one step. The difference may also possibly be due to mechanical differences in the wrap apparatus 1.
Claims (17)
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US06/680,698 US4617781A (en) | 1984-12-12 | 1984-12-12 | Polypropylene wrap end seals and process for making same |
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US06/680,698 US4617781A (en) | 1984-12-12 | 1984-12-12 | Polypropylene wrap end seals and process for making same |
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US4617781A true US4617781A (en) | 1986-10-21 |
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Cited By (13)
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US4881644A (en) * | 1988-09-16 | 1989-11-21 | Playtex Family Products Corporation | Tampon applicator wrap |
EP0395370A1 (en) * | 1989-04-25 | 1990-10-31 | Harlands Of Hull Limited | A method of packaging objects |
US5076040A (en) * | 1990-01-02 | 1991-12-31 | W.A. Lane, Inc. | Seal bars having asymmetric surface features |
US5389067A (en) * | 1992-05-20 | 1995-02-14 | Playtex Family Products Corporation | Tampon applicator and method of making same |
EP0649789A1 (en) * | 1993-10-05 | 1995-04-26 | Hauni Richmond, Inc. | Method and apparatus for making tubular envelopes |
EP0711705A3 (en) * | 1994-11-08 | 1996-12-11 | Hauni Richmond Inc | Method of and apparatus for wrapping tampons |
EP1477406A1 (en) * | 2003-05-13 | 2004-11-17 | G.D Societ Per Azioni | Tampon packing method and machine |
US20050016664A1 (en) * | 2003-07-25 | 2005-01-27 | Kimberly-Clark Worldwide, Inc. | Rotary heat sealing device and method |
US20090247981A1 (en) * | 2008-03-28 | 2009-10-01 | Playtex Products, Inc. | Tampon package and method for making the same |
US20100130954A1 (en) * | 2008-11-26 | 2010-05-27 | Otto Handel | Sealing pattern for tampon overwrap |
US20100130953A1 (en) * | 2008-11-26 | 2010-05-27 | Fung Paul Y | Tampon overwrap |
WO2011117751A3 (en) * | 2010-03-26 | 2012-07-05 | Philip Morris Products S.A. | High speed poucher |
US10603231B2 (en) * | 2015-11-09 | 2020-03-31 | Ontex Bvba | Method and apparatus for manufacturing a tampon packaging |
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US4881644A (en) * | 1988-09-16 | 1989-11-21 | Playtex Family Products Corporation | Tampon applicator wrap |
EP0395370A1 (en) * | 1989-04-25 | 1990-10-31 | Harlands Of Hull Limited | A method of packaging objects |
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EP0649789A1 (en) * | 1993-10-05 | 1995-04-26 | Hauni Richmond, Inc. | Method and apparatus for making tubular envelopes |
EP0711705A3 (en) * | 1994-11-08 | 1996-12-11 | Hauni Richmond Inc | Method of and apparatus for wrapping tampons |
EP1477406A1 (en) * | 2003-05-13 | 2004-11-17 | G.D Societ Per Azioni | Tampon packing method and machine |
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CN100422049C (en) * | 2003-05-13 | 2008-10-01 | G.D股份有限公司 | Tampon packing method and machine |
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WO2009120732A1 (en) * | 2008-03-28 | 2009-10-01 | Playtex Products, Llc. | Tampon package and method for making the same |
GB2470856A (en) * | 2008-03-28 | 2010-12-08 | Playtex Products Llc | Tampon package and method for making the same |
US20090247981A1 (en) * | 2008-03-28 | 2009-10-01 | Playtex Products, Inc. | Tampon package and method for making the same |
US8518005B2 (en) | 2008-11-26 | 2013-08-27 | Mcneil-Ppc, Inc. | Sealing pattern for tampon overwrap |
US20100130954A1 (en) * | 2008-11-26 | 2010-05-27 | Otto Handel | Sealing pattern for tampon overwrap |
US20100130953A1 (en) * | 2008-11-26 | 2010-05-27 | Fung Paul Y | Tampon overwrap |
US8357134B2 (en) * | 2008-11-26 | 2013-01-22 | Mcneil-Ppc, Inc. | Sealing pattern for tampon overwrap |
US8419700B2 (en) | 2008-11-26 | 2013-04-16 | Mcneil-Ppc, Inc. | Tampon overwrap |
US8562579B2 (en) | 2008-11-26 | 2013-10-22 | Mcneil-Ppc, Inc. | Tampon overwrap |
WO2011117751A3 (en) * | 2010-03-26 | 2012-07-05 | Philip Morris Products S.A. | High speed poucher |
JP2013523115A (en) * | 2010-03-26 | 2013-06-17 | フィリップ・モーリス・プロダクツ・ソシエテ・アノニム | High speed pouch making machine |
US9623988B2 (en) | 2010-03-26 | 2017-04-18 | Philip Morris Usa Inc. | High speed poucher |
US10138006B2 (en) | 2010-03-26 | 2018-11-27 | Philip Morris Usa Inc. | High speed poucher |
US10870503B2 (en) | 2010-03-26 | 2020-12-22 | Philip Morris Usa Inc. | High speed poucher |
US11383861B2 (en) | 2010-03-26 | 2022-07-12 | Philip Morris Usa Inc. | High speed poucher |
US11702232B2 (en) | 2010-03-26 | 2023-07-18 | Philip Morris Usa Inc. | High speed poucher |
US10603231B2 (en) * | 2015-11-09 | 2020-03-31 | Ontex Bvba | Method and apparatus for manufacturing a tampon packaging |
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